US7999617B2 - Amplifier circuit - Google Patents

Amplifier circuit Download PDF

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US7999617B2
US7999617B2 US12/161,099 US16109907A US7999617B2 US 7999617 B2 US7999617 B2 US 7999617B2 US 16109907 A US16109907 A US 16109907A US 7999617 B2 US7999617 B2 US 7999617B2
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transistors
current
amplifier
minimum
coupled
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US20100231301A1 (en
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Paul Bruin
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Morgan Stanley Senior Funding Inc
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NXP BV
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Assigned to MORGAN STANLEY SENIOR FUNDING, INC. reassignment MORGAN STANLEY SENIOR FUNDING, INC. CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVE APPLICATION 12092129 PREVIOUSLY RECORDED ON REEL 038017 FRAME 0058. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT SUPPLEMENT. Assignors: NXP B.V.
Assigned to MORGAN STANLEY SENIOR FUNDING, INC. reassignment MORGAN STANLEY SENIOR FUNDING, INC. CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVE APPLICATION 12681366 PREVIOUSLY RECORDED ON REEL 039361 FRAME 0212. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT SUPPLEMENT. Assignors: NXP B.V.
Assigned to MORGAN STANLEY SENIOR FUNDING, INC. reassignment MORGAN STANLEY SENIOR FUNDING, INC. CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVE APPLICATION 12681366 PREVIOUSLY RECORDED ON REEL 038017 FRAME 0058. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT SUPPLEMENT. Assignors: NXP B.V.
Assigned to NXP B.V. reassignment NXP B.V. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: MORGAN STANLEY SENIOR FUNDING, INC.
Assigned to MORGAN STANLEY SENIOR FUNDING, INC. reassignment MORGAN STANLEY SENIOR FUNDING, INC. CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVE APPLICATION 12298143 PREVIOUSLY RECORDED ON REEL 042762 FRAME 0145. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT SUPPLEMENT. Assignors: NXP B.V.
Assigned to MORGAN STANLEY SENIOR FUNDING, INC. reassignment MORGAN STANLEY SENIOR FUNDING, INC. CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVE APPLICATION 12298143 PREVIOUSLY RECORDED ON REEL 038017 FRAME 0058. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT SUPPLEMENT. Assignors: NXP B.V.
Assigned to MORGAN STANLEY SENIOR FUNDING, INC. reassignment MORGAN STANLEY SENIOR FUNDING, INC. CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVE APPLICATION 12298143 PREVIOUSLY RECORDED ON REEL 039361 FRAME 0212. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT SUPPLEMENT. Assignors: NXP B.V.
Assigned to MORGAN STANLEY SENIOR FUNDING, INC. reassignment MORGAN STANLEY SENIOR FUNDING, INC. CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVE APPLICATION 12298143 PREVIOUSLY RECORDED ON REEL 042985 FRAME 0001. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT SUPPLEMENT. Assignors: NXP B.V.
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
    • H03F3/45183—Long tailed pairs
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45644—Indexing scheme relating to differential amplifiers the LC comprising a cross coupling circuit, e.g. comprising two cross-coupled transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45648—Indexing scheme relating to differential amplifiers the LC comprising two current sources, which are not cascode current sources
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45724—Indexing scheme relating to differential amplifiers the LC comprising two cross coupled switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45726—Indexing scheme relating to differential amplifiers the LC comprising more than one switch, which are not cross coupled

Definitions

  • the invention relates to an amplifier circuit.
  • feedback circuits can be used which typically control the quiescent current more accurately and can give more symmetric behavior, which is good for distortion performance. Examples of these are presented in references [1], [2], [7], [8], [9], [10], and [11]. These circuits make use of a minimum selector, which compares the minimum current in the output stage transistors with a reference current. A feedback loop then ensures that the minimum current will stay at the reference level, thus ensuring that none of the output transistors will switch off completely. The feedback loop allows for accurate control of the quiescent and minimum currents in the output stage.
  • references [1] and [2] uses the same type of minimum selector as some embodiments of the current invention, but it needs an extra stage for class-AB current control, in which the minimum current in the output stage transistors is compared to a reference current and the result is converted to a differential signal that is fed back to the output stage transistor.
  • the invention provides an amplifier circuit as defined in claim 1 .
  • Advantageous embodiments are defined in the dependent claims.
  • a primary aspect of the invention provides an amplifier circuit that comprises a differential input stage, two cross-coupled current mirrors coupled to respective outputs of the differential input stage, and a minimum selector circuit coupled to outputs of the current mirrors.
  • An advantageous embodiment of the invention does not need an extra intermediate amplifier stage, connected to its minimum selector, to realize the class-AB behavior. In this way circuit area and also supply current can be saved.
  • FIG. 1 shows a first embodiment of an amplifier circuit in accordance with the invention
  • FIG. 2 shows an embodiment with constant tail current for the input stage
  • FIG. 3 shows an embodiment with constant tail current for the input stage and asymmetrical minimum selectors.
  • two cross-coupled current mirrors M 3 , M 4 and M 5 , M 6 are placed on top of a differential input stage M 1 and M 2 that receives a differential input voltage V IN +, V IN ⁇ .
  • These two current mirrors pose a low impedance for common mode signals from the input stage (the bias current) and a high impedance for differential currents (the signal current).
  • These differential currents will go to the gates of the common source PMOS transistors M 7 and M 8 , which form a second differential stage.
  • the bias current in transistors M 7 and M 8 is well controlled and is a scaled copy of the bias currents in the current mirrors M 3 , M 4 and M 5 , M 6 .
  • the scaling can be done by scaling of the dimensions of the PMOS transistors.
  • the differential output current of transistors M 7 and M 8 is transformed to a single ended current by current mirror M 9 , M 10 .
  • An output voltage V OUT is available at the drain of transistor M 10 .
  • a simple minimum selector is added.
  • This minimum selector basically has two MOS transistors M 11 and M 12 in series, of which the one that has the least drive on the gate, will determine the current.
  • a second series connection of MOS transistors M 13 and M 14 is added to get symmetrical behavior. If the current in the minimum selector is less than the intended value, more current will run through transistors M 1 and M 2 , and thus through transistors M 3 , . . . M 6 , and eventually in the output stage. In this way the current in the output stage is accurately controlled.
  • the embodiment of FIG. 2 comprises a first minimum selector M 11 , M 12 , M 11 a , M 12 a , and a second minimum selector M 13 , M 14 , M 13 a , M 14 a to ensure that the minimum current is no longer influencing the tail current of the differential pair, whereby distortion is reduced.
  • FIG. 3 A second alternative is shown in FIG. 3 , where a first asymmetrical minimum selector M 11 , M 12 , and a second asymmetrical minimum selector M 13 , M 14 have been used.
  • Advantageous embodiments of the invention provide a very compact circuit realizing an amplifier circuit with a class-AB common source output stage.
  • Prior art class-AB output stages typically consist of quite complex circuits, resulting in large chip area.
  • a practical embodiment of this invention combines two cross-coupled current mirrors with a simple MOS minimum selector, to obtain a very compact two stage amplifier, that can be biased very easily from one current source only.
  • the circuit can be used in any circuit where a high loop gain and a class-AB behavior are desired. Examples of this are current to voltage conversion in A/D converters, audio circuits, and buffers for reference voltages.
  • the circuit may be used in a reference buffer in an MP3 player IC, to load and unload a reference capacitor. To achieve the required charge and discharge times a substantial current is needed. Furthermore a high loop gain is required to achieve high accuracy of the reference voltage.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • the word “comprising” does not exclude the presence of elements or steps other than those listed in a claim.
  • the word “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US12/161,099 2006-01-18 2007-01-17 Amplifier circuit Active 2027-02-15 US7999617B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP06100521 2006-01-18
EP06100521 2006-01-18
EP06100521.1 2006-01-18
PCT/IB2007/050154 WO2007083271A1 (en) 2006-01-18 2007-01-17 Amplifier circuit

Publications (2)

Publication Number Publication Date
US20100231301A1 US20100231301A1 (en) 2010-09-16
US7999617B2 true US7999617B2 (en) 2011-08-16

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US12/161,099 Active 2027-02-15 US7999617B2 (en) 2006-01-18 2007-01-17 Amplifier circuit

Country Status (6)

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US (1) US7999617B2 (de)
EP (1) EP1980017B1 (de)
JP (1) JP2009524327A (de)
CN (1) CN101371435A (de)
AT (1) ATE524873T1 (de)
WO (1) WO2007083271A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110130109A1 (en) * 2009-12-02 2011-06-02 Kabushiki Kaisha Toshiba Differential amplifier circuit and wireless receiving apparatus

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101373952B (zh) * 2007-08-24 2010-09-08 锐迪科创微电子（北京）有限公司 可实现差分放大的低噪声放大器及方法
JP2010219486A (ja) * 2009-03-19 2010-09-30 Renesas Electronics Corp 中間電位発生回路
EP3012972B1 (de) * 2014-10-23 2017-07-19 ams AG Verstärkerschaltung und Verstärkeranordnung
CN105720928B (zh) * 2016-01-22 2018-08-03 西安电子科技大学 一种两级差动低噪声放大器
US10782347B2 (en) 2017-10-23 2020-09-22 Nxp B.V. Method for identifying a fault at a device output and system therefor
US10436839B2 (en) * 2017-10-23 2019-10-08 Nxp B.V. Method for identifying a fault at a device output and system therefor
WO2022045106A1 (ja) * 2020-08-28 2022-03-03 三菱電機株式会社 コンパレータ、発振器、及び、電力変換器
US11656642B2 (en) 2021-02-05 2023-05-23 Analog Devices, Inc. Slew rate improvement in multistage differential amplifiers for fast transient response linear regulator applications

Citations (6)

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Publication number Priority date Publication date Assignee Title
EP0776087A1 (de) 1995-11-24 1997-05-28 Deutsche ITT Industries GmbH CMOS-Transkonduktanzverstärker mit gleitendem Arbeitspunkt
US20020060607A1 (en) 2000-11-20 2002-05-23 Forejt Brett E. Novel high output swing comparator stage
US20030038678A1 (en) 2000-02-11 2003-02-27 Vincent Dessard Differential amplifier with gain substantially independent of temperature
US6741130B2 (en) * 2002-09-23 2004-05-25 Meng-Jer Wey High-speed output transconductance amplifier capable of operating at different voltage levels
US6771126B2 (en) * 2001-03-30 2004-08-03 Winbond Electronics Corporation Slew rate enhancement circuit and method
US7576610B2 (en) * 2006-05-31 2009-08-18 Stmicroelectronics S.R.L. Operational amplifier of class AB

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
EP0776087A1 (de) 1995-11-24 1997-05-28 Deutsche ITT Industries GmbH CMOS-Transkonduktanzverstärker mit gleitendem Arbeitspunkt
US20030038678A1 (en) 2000-02-11 2003-02-27 Vincent Dessard Differential amplifier with gain substantially independent of temperature
US20020060607A1 (en) 2000-11-20 2002-05-23 Forejt Brett E. Novel high output swing comparator stage
US6771126B2 (en) * 2001-03-30 2004-08-03 Winbond Electronics Corporation Slew rate enhancement circuit and method
US6741130B2 (en) * 2002-09-23 2004-05-25 Meng-Jer Wey High-speed output transconductance amplifier capable of operating at different voltage levels
US7576610B2 (en) * 2006-05-31 2009-08-18 Stmicroelectronics S.R.L. Operational amplifier of class AB

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De Langen K-J et al; "Compact Low-Voltage Power-Efficient Operational Amplifier Cells for VLSI", IEEE Journal of Solid-State Circuits, vol. 33, No. 10, Oct. 1998, pp. 1482-1896.
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Huijsing J.H. et al; "Low-Power Low-Voltage VLSI Operational Amplifier Cells", IEEE Transactions on Circuits and Systems-I: Fundamental Theory of Applications, vol. 42, No. 11, Nov. 1995, pp. 841-852.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110130109A1 (en) * 2009-12-02 2011-06-02 Kabushiki Kaisha Toshiba Differential amplifier circuit and wireless receiving apparatus
US8676148B2 (en) * 2009-12-02 2014-03-18 Kabushiki Kaisha Toshiba Differential amplifier circuit and wireless receiving apparatus

Also Published As

Publication number Publication date
WO2007083271A1 (en) 2007-07-26
CN101371435A (zh) 2009-02-18
US20100231301A1 (en) 2010-09-16
JP2009524327A (ja) 2009-06-25
EP1980017A1 (de) 2008-10-15
ATE524873T1 (de) 2011-09-15
EP1980017B1 (de) 2011-09-14

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